CSE 123: Computer Networks Fall Quarter, 2013 MIDTERM EXAM
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1 CSE 123: Computer Networks Fall Quarter, 2013 MIDTERM EXAM Instructor: Alex C. Snoeren Name Student ID Question Score Points Total This exam is closed book. You are allowed one 8.5x11-inch (or smaller), double-sided sheet of paper containing whatever you would like (a crib sheet ). YOU MUST PUT YOUR NAME ON IT AND TURN THE CRIB SHEET IN WITH THE EXAM. The exam contains questions of differing point values. Each question is clearly labeled with its value. Please answer all questions in the space provided. You have 50 minutes to complete this exam. As with any exam, I suggest you read through all the questions first before answering any of them. You will receive full credit for the final question regardless of your answers, but we would appreciate you taking the time to provide feedback. In order to preserve the anonymity of your responses, please tear off the last page of the exam. You may submit it separately at the end of the exam, or bring it to class with you on Friday. GOOD LUCK! 1
2 1. (21 pts) True/False. Determine whether each of the following statements is true or false. No explanation is necessary; partial credit will not be awarded. a) Each station in an FDMA system can use only a portion of the channel bandwidth. b) If a code has sufficient Hamming distance to correct n errors, it can detect at least n more. c) Manchester encoding is more efficient than NRZI. d) A bridge responds to an ARP query. e) A checksum and CRC of equal length (e.g., 32 bits) can detect the same number of bit errors. f) Clock-based framing can avoid the need for sentinels. g) The.edu TLD name server knows the IP address of the authoritative name server for ucsd.edu. 2
3 2. (30 pts) Short Answer. Concisely answer the following questions. a) (5 pts) Why does CSMA out-perform Aloha? Give a specific example. b) (5 pts) What is the purpose of the Ethernet jamming signal? c) (5 pts) Consider a slotted Aloha network with 7 stations. For a given slot, each station transmits with probability p. What is the probability that some node successfully transmits a packet in that slot? d) (5 pts) Consider the CRC generator function x 13 + x 7 + x 3 + x How many bits will the resulting frame check sequence be? e) (10 pts) For a channel of a given bandwidth, with a signal-to-noise ratio of 3:1, how much larger a signal-to-noise ratio is required to double the effective capacity? Show your work. 3
4 3. (40 pts) IP forwarding. Consider the network diagram below. Each router (a square in the figure) is labeled with the names of its interfaces (e.g., eth0) and the IP addresses assigned to each. Each network (a circle) is labeled with its network name and prefix length /17 A B / eth eth3 R1 eth eth2 eth eth0 R2 eth2 eth C / D / eth0 R3 eth3 eth eth E /23 F /24 a) (10 pts) The machine I m typing this on has an IP address To which of the networks above am I connected? What is the subnet mask my machine should use? b) (10 pts) What is the most concise CIDR block R2 can use to describe the networks reachable through R3? 4
5 c) (20 pts) Suppose R1 and R3 contain the following forwarding tables, respectively: Destination Next Hop Interface / lo0 default eth /24 eth /24 eth / eth /24 eth /17 eth0 Destination Next Hop Interface / lo0 default eth /24 eth /23 eth /24 eth /24 eth3 What path would a packet from my machine follow to a host on network F? Explain how the packet is forwarded by showing the rows in each forwarding table that would be invoked. If the packet is forwarded by R2, please list the forwarding table entries in R2 s table that would be used. 5
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7 PLEASE TEAR OFF THIS PAGE OF THE EXAM. YOU CAN SUBMIT IT AT THE END OF THE PERIOD, OR BRING IT TO CLASS ON FRIDAY. 4. (10 pts) Feedback. Please provide feedback to allow the Professor to improve your class experience. What is one thing that is going well for you in this class? What is one thing that is not working well for you in this class? What can we do to help? Is there something you would like the staff to do differently? Please estimate the amount of time you spent on each homework and the project. Do you find the assigned readings helpful? 7
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